1/*
2 *  Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_
12#define WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_
13
14#include "webrtc/base/scoped_ptr.h"
15#include "webrtc/typedefs.h"
16
17namespace webrtc {
18
19class FIRFilter;
20
21// A single node of a Wavelet Packet Decomposition (WPD) tree.
22class WPDNode {
23 public:
24  // Creates a WPDNode. The data vector will contain zeros. The filter will have
25  // the coefficients provided.
26  WPDNode(size_t length, const float* coefficients, size_t coefficients_length);
27  ~WPDNode();
28
29  // Updates the node data. |parent_data| / 2 must be equals to |length_|.
30  // Returns 0 if correct, and -1 otherwise.
31  int Update(const float* parent_data, size_t parent_data_length);
32
33  const float* data() const { return data_.get(); }
34  // Returns 0 if correct, and -1 otherwise.
35  int set_data(const float* new_data, size_t length);
36  size_t length() const { return length_; }
37
38 private:
39  rtc::scoped_ptr<float[]> data_;
40  size_t length_;
41  rtc::scoped_ptr<FIRFilter> filter_;
42};
43
44}  // namespace webrtc
45
46#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TRANSIENT_WPD_NODE_H_
47